STM32和OV2640的嵌入式图像采集系统设计

基于STM32嵌入式系统及200万摄像头OV2640设计了图像采集系统,分析了系统的基本硬件架构,分别对不同模块的功能特点作出了简单的介绍;对系统的软件设计给出了详细的说明,介绍了系统初始化的基本思路和流程,以及相关外围设备模块在程序中的使用;并给出了系统的整体设计思路,实现了系统的稳定运行。     

Visual experience for autostereoscopic 3D projection display

In order to investigate visual experience for watching the autostereoscopic three‐dimensional (3D) projection display, we conduct a subjective evaluation experiment by a questionnaire when viewing video clips. Factor analysis is adopted to classify the evaluation items for the perpetual constructs of visual experience. Then a mixed design with repeated measurement analysis of variance with dimension and display duration as factors is carried out on the evaluation data to check the factorial effects and interactions for statistical significance. The results of factor analysis extract five factors including visual comfort, image quality, distortion, naturalness, and presence, which can be used as comprehensive indicators to evaluate the autostereoscopic 3D projection display. The results of analysis of variance indicate that image quality, which is used to assess two‐dimensional contents, is no longer applicable. It is necessary to give consideration to depth when evaluating 3D visual experience. Although 3D scenes enhance the overall subjective performance such as naturalness and presence, the health issues and stereoscopic distortion related to the introduction of depth cannot be ignored.     

辣椒疫病菌对氟吗啉的抗药性研究

为了评估氟吗啉的未来抗性风险，以辣椒疫病菌为靶标，通过室内抗性菌株的驯化、筛选，以及紫外线诱变等方法，初步探索了辣椒疫病菌对氟吗啉的抗性情况。结果表明：抗性菌株对氟吗啉的抗性倍数较低，在3.45～11．33，生长速率明显低于野生敏感菌株。由此可见辣椒疫病菌对氟吗啉的抗性风险可能较低。     

实验动物在血液制品中的应用

目的：阐述实验动物在血液制品生产质量控制过程中应用的重要性。方法：按《中华人民共和国药典》2005年版三部要求及相关项目的技术规范进行血液制品质量控制。结果：血浆数量150吨,可同时生产以下品种的产品,人血白蛋白共30批次,总瓶数约40万瓶（折10g）;免疫球蛋白类：共30批次,总瓶数约30万瓶（折2.5g）;人纤维蛋白原：共30批次,总瓶数约15万瓶（折0.5g）;人凝血酶原复合物：共30批次,总瓶数约12万瓶（折300IU）;人凝血因子Ⅷ：共30批次,总瓶数约10万瓶（折200IU）。需使用家兔870只、豚鼠300只小鼠750只。结论：实验动物应用于血液制品生产质量控制发挥了非常重要的作用。     

基于FT245BM的USB接口开发

为了实现一种简易高速的并且可以方便移植的USB接口的开发,设计了以FTDI公司的FT245BM为USB接口的芯片,该芯片实现了PC机和微控制器之间通过USB口的简易高速数据通信,使用性较好.     

混合匹配规则的否定选择算法

针对目前基于免疫的检测器生成算法中,匹配规则单一造成的检测器质量低下的问题,提出一种基于混合匹配规则的否定选择算法,采用海明距离整体匹配的各段内R连续比特匹配的否定选择算法,即混合匹配否定选择算法,对算法的性能进行了分析．实验结果表明,该算法能够高效地产生所需要的检测器,提高了检测率,且降低了误报率．     

车辆悬架减震优化设计方法仿真

车辆在不同路况和不同车速等情况下,悬架系统弹性元件受到的冲击大小差异很大,无法形成固定的振动规则,振动剧烈程度与阻尼系数无法关联.传统车辆悬架减振设计方法,采用固定阻尼系数来减少弹性元件的振动,没有考虑不同路况及车速产生的振动剧烈程度不同的问题,减振效果较差.提出一种车辆悬架减震优化有限元设计方法,分析车辆悬架减震器的功能和结构,塑造车辆悬架减震优化模型,采用ANSYS有限元软件中一阶优化方法进行车辆悬架减振优化设计,以悬架减震器阻尼力为优化目标,以减震器阻尼系数为优化设计变量,以静强度和最大减震强度为约束条件,对车辆悬架减震进行有限元优化设计,确保车辆车身振动迅速衰弱,使车身能够很快达到一种稳定状态.实验结果表明,上述方法使车辆减震阻尼力和最大减震强度都优于传统方法,具有较高的稳定性和控制精度.     

多核程序交互理论及应用

多核处理器上共享缓存使用效率,即程序局部性是影响并行程序性能的关键因素之一。提出了以足迹为基础的局部性理论。介绍了缺失率、重用距离和足迹之间的转化关系,并利用足迹可组合性特征建立了并行程序局部性预测模型。     

Transient behaviour of encapsulated enzyme reactor systems

Mathematical models are developed for the transient behaviour of encapsulated enzyme reactor systems such as the continuous stirred tank reactor (CSTR) and the packed bed tubular reactor. The rate processes taking place in the encapsulated enzyme bed are approximated by using a combined rate control model of enzyme reaction and membrane diffusion. The change in transient substrate concentration is obtained by using the developed rate expression in the material balance over the substrate as a function of time for the CSTR and as a function of time and position for the packed bed tubular reactor. The effects of various parameters such as the enzymic reaction rate constant, Michaelis constant, diffusional resistance of membranes, and Peclet number on the substrate concentration distribution, which varies with respect to operating time, are investigated. This study affords insight into the transient operating characteristics of the encapsulated enzyme reactor system. The results should be useful in understanding the start-up performance of the reactor systems and to control such reactor systems at desired operating conditions.